Derrick



(No Model.)

J. LE DUKE.. y z'svneets-sneet 1.

DERRIGK. No. 352,333.

Patented Nov. 9, 1886.

N. PETERS. Phum-Limngnphor. wzshingwn. D. C.

(No Model.) 2 Sheets-Sheet 2.

J. LB DUKE.

DERRIGK.

No. 352,333. 'Patented Nov. 9, 1886.

ilLlllllllgllllllllglllwl gull lllgzv N. PETERSA Pholnnhugnphr, wqshingmn, D. t:4

Trice.

PATENT JEREMIAH LE DUKE, OF BEREA, OHIO.

DERRICK.

SPECIFICATION'forming part of Letters Patent No. 352,333, dated November 9, 1886.

Application filed J'uy 13, 1886. Serial No. 207,8ll.

-To @ZZ whom it may concern,.-

Be it known that I, JEREMIAH LE DUKE, of Berea, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Derricks; and I do hereby declare the following to be a-full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to improvements in derricks; and it consists in certain features of construction and in combination of parts, hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure l is a side elevation of a derrick embodying my invention. Fig. 2 is an enlarged elevation in section of the lower part of the d'errick. Fig. 3 is a plan in section on the line ofz z, Fig. 2. Fig. 4 is a top plan. Fig. 5 is an elevation in transverse section on theline :t Fig. 8.- Fig. 6 is an elevation in section on the line of i y, Fig. 5. Fig. 7 is an elevation in section of the top cap of the post. Fig. Sis an enlarged plan inl section on the bent line x x, Fig. l.

A represents a hollow revolving post, preferably made of large extra-heavy metal tubing. A flanged cap, A', is screwed on or otherwise attachedto the top of t-he post, to which cap is bolted the jib B. The jib consists of two broad pieces of timber set edgewise and blocked apart far enough to accommodate the hoisting-ropes. So-called travelers C, having ianged wheels that travel on the upper edge of the jib-timbers, have sheaves c, on which the hoisting-rope D operates. The one end of the rope `D is attached to the post-for instance, at a-a-nd from thence run over one set of sheaves on the travelers; thence round a sheave, d, ofthe hoisting-block; thence back over the other set of sheaves of the travelers and over the sheave c', and through a hole in the post; thence downward through the cavity in the post. The sheave a is of considerable size, and guides the rope well in-toward the center of the post. The jib is supported. by braces F, arranged in pairs, and secured to the post by iron plates f, the latter being bolted to the-post on opposite sides thereof.. The draft of the hoisting-rope would ofcourse tend to move the travelers toward the center of the jib, to control which I provide ropes C',

(No model.)

that are attached, respectively, to the outer ends of the travelers, and from thence lead around lateral sheaves c', that are mounted on the ends of the jib. From thence the ropes Gf lead over sheaves c2, set vertically and arranged side by side near the center of the jib, and from thence the two ropes C lead to the windlass G. By turning the windlass both ropes C are wound or iinwound alike, and the travelers are held at equal distances from the center of the jib. As ropes are slacked off, the travelers ofcourse move toward the center of the jib, and are drawn apart by winding up the rope. With this arrangement of parts the load can be lifted and carried to any point along the jib, and the draft of the hoistingrope balances the jib perfectly, so that no more strain is had on one side than on the other.

The post A sets inside the metal tube H. The latter has a cap, H', on top, with a hole in the center large enough to receive the post without contact. An internal annular shoulder, h, supports a series of smaller lateral wheels, It', or balls, if preferred, that come in contact with the post and hold the same laterall y. A detachable tiange, h2, covers the lateral wheels and the chamberfinwhich these wheels operate. and extends perhaps four or tive inches (more or less) outside the tube H, leaving a square broad shoulder, H2, atv the bottom for engaging jack-screws or other ,mechanism for elevating the tube.

The tube H at the lower end has a head, I, and the post has a head, A2. These heads have central openings large enough to allou7 of the passage of the rope D. The heads have corresponding annular grooves, respectively A3 and I', in which operate aseries of balls, z'.

The outer shoulder ofthe groove I extends a' tritle above the center of the ball, and the`inner shoulder of the groove A3 extends slightly below the center ofthe ball, by which arrangement the foot of the post is held from lateral displacement; atthe same time the balls, of course, support 'the post.

The mechanism for revolving the post is as follows: A worin-gear, J, is secured to the post just above the cap H. The cap has upwardlyprojecting ears m, in which is journaled the hub of the yoke L. The spindle p ofthe Worm The cap H is of considerable size,

Vis left forthe passage of the latter.

P is journaled in the hub of'the yoke, eccentric wil-h the axis of the latter. The yoke is provided with a handle, l, for turning the same, by means o1' which the Worin may be thrown in orout of gear with the Wheel J. When the worin isout of gear, the der-rick may be revolved by hand, and when near the de sired position the worms may be thrown in gear and the derriek turned to 'the exact point desired. When the worm is lel't in gear, the derrick is of course locked. y

In operating the device the derrick is at first held by guys until a sufficient amount of stone-Work is laid around the tube'H, after which the device is self-sustaining.

The sheave K is placed and left inA the stonework to guide the rope D, and a suitable hole When the stonework has been built to ucar the cap H,the tube isr raised far enough to receive another layer of stone. VIn this manner, for instance, a pier located iu ariver may be carried lup to any height, and without obstructing navigation by guy-ropes. The derrick, therefore, may be conveniently operated in places where it would be impracticable to support a derrick by guyropes.

What I claim iS- 1. The combination, with a post, ajib rigidly secured to the top thereof, and a tube inclosing the lower portion of the post, of anti- Y friction balls or wheels for supportingthe post vertically and laterally and devices se-4 cured to the upper end of the tube and engaging the post for revolving the latter, substantially as set forth.

2. In a derrick, the combination. with a hollow post, a jib mounted thereon. and a tube for su'pportingthe post` the parts being arranged substantially as indicated. of a worm-gear secured to the post, a Worin mounted on an attach ment of tbe outer tube for engaging the worm-gear in revolving the post, and an eccentric yoke for supporting .the worm, said" yoke fnrnisbingvmeans for engaging and disengaging the gear, 'substantially as set forth.

3. In a derrick, the combination, with a post and a jib mounted thereon, substantially as indicated, of so-called travelers mounted onthe jib, ropes, arranged substantially as shown, for holding the travelers on opposite sides of and at equal distances from the line of the post, and hoisting-ropes, arranged substautially as shown, and made to pass over the sheaves of the respective travelers, whereby the draft of the hoisting-ropes is sustained equally by the two arms of the jib. In testimony Whereof I sign this specification, inthe presence of two witnesses, this 29th day of Ma-y, 1886.

JEREMIAH LE DUKE. Witnesses:

CHAs. H. DORER, ALBERTE. LYNCH. 

